One of two things jump to mind.
Either:
1. The mechanism is not releasing properly in which case you should check the action (have someone manipulate the release lever while you watch to see if the business end is working properly) and make sure there is no debris or what not gumming up the works
or
2. The spring that would pop the door open is not working right. Check that there is some resistance in the spring/make sure it's still there.
That's what comes immediately to mind. I'm pretty sure you'll find one of those two to be the culprate.
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